Question:
A particle of mass $0.3 \mathrm{~kg}$ is subjected to a force $\mathrm{F}=-\mathrm{k} \mathrm{x}$ with $\mathrm{k}=15 \mathrm{~N} / \mathrm{m}$. What will be its initial acceleration if it is released from a point $x=20 \mathrm{~cm}$ ?
Solution:
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